Re: Another preempt folding issue?

[Peter Zijlstra]

On Wed, Feb 12, 2014 at 09:20:24AM +0100, Stefan Bader wrote:
> On 11.02.2014 20:45, Peter Zijlstra wrote:
> > On Tue, Feb 11, 2014 at 07:34:51PM +0100, Stefan Bader wrote:
> >> Hi Peter,
> >>
> >> I am currently looking at a weird issue that manifest itself when trying to run
> >> kvm enabled qemu on a i386 host (v3.13 kernel, oh and potentially important the
> >> cpu is 64bit capable, so qemu-system-x86_64 is called). 
> > 
> > AMD or Intel machine?
> 
> Personally I am reproducing this on an AMD:
> 
> cpu family	: 15
> model		: 72
> model name	: AMD Turion(tm) 64 X2 Mobile Technology TL-64
> 
> but the reports I got are showing the same issue on an Intel i7
> 
> cpu family	: 6
> model		: 37
> model name	: Intel(R) Core(TM) i7 CPU       M 620  @ 2.67GH
> 
> Another reporter also saw this on an AMD and said it could not be reproduced on
> the same hardware and the same software versions when using 64bit instead of 32.
> 
> In my case on a 32bit installation I will see this on every invocation of

Curious.. so its both AMD and Intel.

That makes funny hardware less likely... but how can the vmexit loose an
interrupt like this.


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